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Software Engineer Interview Prep Podcast · March 25 · 1 hr 5 min

JVM Internals Deep Dive 8-25 LTS

JVM Architecture Overview — runtime data areas, memory model, flag reference table Class Loading Subsystem — delegation model, loading phases, JPMS/Jigsaw module system Execution Engine & JIT — tiered compilation levels (0→4), inlining, escape analysis, loop vectorisation, SIMD intrinsics, speculative optimisation and deoptimisation Garbage Collection Algorithms — deep dives on G1, ZGC (coloured pointers, load barriers, concurrent relocation), and Shenandoah; full comparison table across all collectors LTS-by-LTS Optimisation History: GC Configuration & Tuning — selection guide, essential flags, unified GC logging Monitoring & Profiling — JFR, jcmd/jstack/async-profiler, key production metrics Virtual Threads & Modern Concurrency — VT vs platform threads, migration checklist, StructuredTaskScope pattern Performance Tuning Playbook — symptom→root cause table, AppCDS, CRaC, GraalVM Native Evolution Timeline — Java 8→25 at a glance

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show notes

  • JVM Architecture Overview — runtime data areas, memory model, flag reference table
  • Class Loading Subsystem — delegation model, loading phases, JPMS/Jigsaw module system
  • Execution Engine & JIT — tiered compilation levels (0→4), inlining, escape analysis, loop vectorisation, SIMD intrinsics, speculative optimisation and deoptimisation
  • Garbage Collection Algorithms — deep dives on G1, ZGC (coloured pointers, load barriers, concurrent relocation), and Shenandoah; full comparison table across all collectors
  • LTS-by-LTS Optimisation History:
  • GC Configuration & Tuning — selection guide, essential flags, unified GC logging
  • Monitoring & Profiling — JFR, jcmd/jstack/async-profiler, key production metrics
  • Virtual Threads & Modern Concurrency — VT vs platform threads, migration checklist, StructuredTaskScope pattern
  • Performance Tuning Playbook — symptom→root cause table, AppCDS, CRaC, GraalVM Native
  • Evolution Timeline — Java 8→25 at a glance

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